React Native - iOS and App Center Deployment build failed from main.jsbundle

Firstly thank you for taking the time to help me find a result. Just a bit of background on what I've done so you know what angles I've taken.

React - "react-native": "0.62.2"

1. I'm using App center to deploy my iOS app (this is where the issue lies),
2. I have three schemes for iOS Dev, Beta, Prod (each building fine in xCode),
3. I'm using Code push as well,
4. App has been on Test flight working fine for a week

I encountered a build issue "no URL bundle present" when running locally both in debug and in release. However I found a solution for that here: https://www.youtube.com/watch?v=eCs2GsWNkoo which works great. I added the main.jsbundle into build phases>> Copy bundle resources as well which fixed the issue occurring during release. Archiving tests now all works.

However My issue is when I build the app on App Center with the main.jsbundle in Copy Bundle resources the build fails and I believe this is because App Center creates that file itself? The error I face is:

The following build commands failed:    CpResource /Users/runner/work/1/s/ios/main.jsbundle /Users/runner/Library/Developer/Xcode/DerivedData/aLifeLived-hjrawomvzxvvvdeuplegfjyupvhr/Build/Intermediates.noindex/ArchiveIntermediates/aLifeLived/InstallationBuildProductsLocation/Applications/A\ Life\ Lived.app/main.jsbundle(1 failure)

Knowing this I then went back into xCode and removedmain.jsbundle from Copy bundle resources, re ran the build in App Center and it builds successfully...However when it appears on test flight it crashes on startup.

I believe the cause of the crash on Test Flight is due to no main.jsbundle or the one that is produced through App Center if they produce one - The reason I say this is 1. I can't run the app in release locally 2. I did a manual deploy to test flight (archived in xCode, download ipa file, uploaded to App Center, deployed).

I'm stuck on what to do, can someone please help?

Thanks!

Update:

I also attempted to build with legacy build system however this then resulted in the below error with App Center:

The following build commands failed:    Ld /Users/runner/Library/Developer/Xcode/DerivedData/aLifeLived-hjrawomvzxvvvdeuplegfjyupvhr/Build/Intermediates.noindex/ArchiveIntermediates/aLifeLived/IntermediateBuildFilesPath/aLifeLived.build/Release-iphoneos/aLifeLived.build/Objects-normal/armv7/A\ Life\ Lived normal armv7    Ld /Users/runner/Library/Developer/Xcode/DerivedData/aLifeLived-hjrawomvzxvvvdeuplegfjyupvhr/Build/Intermediates.noindex/ArchiveIntermediates/aLifeLived/IntermediateBuildFilesPath/aLifeLived.build/Release-iphoneos/aLifeLived.build/Objects-normal/arm64/A\ Life\ Lived normal arm64(2 failures)